Changes Around Us Book Back Questions & Answers
Unit 3 > Science > Class 6 > Samacheer Kalvi - English Medium
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1. When ice melts to form water, change occurs in its
a. position
b. colour
c. state
d. composition
Correct answer: c. state
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2. Drying of wet clothes in air is an example of
a. Chemical change
b. Undesirable change
c. irreversible change
d. physical change
Correct answer: d. physical change
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3. Formation of curd from milk is
a. a reversible change
b. a fast change
c. an irreversible change
d. an undesirable change
Correct answer: c. an irreversible change
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4. Out of the following an example of a desirable change is
a. rusting
b. change of seasons
c. earthquake
d. flooding
Correct answer: b. change of seasons
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5. Air pollution leading to Acid rain is a
a. reversible change
b. fast change
c. natural change
d. human made change
Correct answer: d. human made change
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1. Magnet attracts iron needle. This is_______change. (a reversible / an irreversible)
Correct answer: a reversible
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2. Boiling of egg results in___________ change. (a reversible / an irreversible)
Correct answer: an irreversible
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3. Changes that are harmful to us are__________ . (desirable / undesirable)
Correct answer: undesirable
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4. Plants convert Carbon-di-oxide and water into starch. This is an example of__________change. (natural / human made)
Correct answer: natural
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5. Bursting of fire crackers is a --------------- change whereas germination of seeds is a__________change. (slow / fast)
Correct answer: fast,slow
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1. Growing of teeth in an infant is slow change.
Correct answer: True
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2. Burning of match stick is a reversible change.
Correct answer: False
Correct Statement: The match stick undergoes a chemical change. It is an irreversible change
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3. Change of New moon to Full moon is human made.
Correct answer: False
Correct Statement: Change of New moon to Full moon is a natural change
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4. Digestion of food is a physical change.
Correct answer: False
Correct Statement: The digested food undergoes chemical change
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5. In a solution of salt in water, water is the solute
Correct answer: False
Correct Statement: In a solution of salt in water, water is a solvent
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1. Curdling of milk : irreversible change :: Formation of clouds : ________change
Correct answer: reversible
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2. Photosynthesis : __________ change :: burning of coal : Human made change
Correct answer: natural
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3. Dissolving of glucose : reversible change :: Digestion of food:___________ change
Correct answer: irreversible
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4. Cooking of food : desirable change :: decaying of food : _________change
Correct answer: undesirable
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5. Burning of matchstick :_______ change: Rotation of the Earth : Slow change
Correct answer: fast
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1. Growth of a child, Blinking of eye, Rusting, Germination of a seed
Correct answer: Rusting (Rusting is undesirable change. Others three are desirable changes.)
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2. Glowing of a bulb, lighting of a Candle, breaking of a coffee mug, curdling of milk
Correct answer: Breaking of a coffee mug (Breaking of a coffee mug is undesirable change. Others three are desirable changes.)
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3. Rotting of an egg, condensation of water vapour, trimming of hair, Ripening of fruit
Correct answer: Rotting of an egg (Rotting of an egg is undesirable change. Others three are desirable changes.)
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4. Inflating a balloon, popping a balloon, fading of wall paint, burning of kerosene
Correct answer: Inflating a balloon (Inflating a balloon is a reversible change. Others three are irreversible changes)